President HR 2510 interesting findings...

[Lkaskel]

Hi Gang,
So, I picked up an HR 2510 and I have found some interesting thing sthat I have not seen in one before. This will be my 5th 2510 that I have worked on by the way. The 1st discovery was the the confuguration for the switch that was installed on the back. It has a resistor and diode tied to IC 103 (see below). Turns out that this model 2510 had talkback built in that could not be turned off. The original OP installed a switch and these parts to turn it off. Also, Q121 is missing. I am unsure what MOD that is at this point. It has a potentiometer installed for variable AM carrier, 11 meter mod and a few other things I am still trying to figure out if they are factory MODs or not such as this transistor mounted on the bottom (see below). Finally, if you have a 2510 I cannot stress enough the need to remove the glue. The amount of glue that was already corrosive was unreal. In this radio L124 had 2 out of the 3 wires eaten off. They were missing all together. Fortunantly, I have run into this before so I already had the coated wire for the re-wrap. It was a LOT of glue though!!!! See below.





That's all for now...

 

[doffo]

Eventually I will take another go at the two HR2510 radios I got. 1st one has been the biggest problem, but the 2nd one I brought back from the dead by replacing a shorted diode/cap early on where the power comes in to the radio.

 

[Chevboy0167]

The diode mod to IC103 is very common. I do it on rigs that have the talkback bleed through.

The transistor on the main board is factory. Usually held down with Sony Death Bond. Remove that crap and use HY910 Thermal Adhesive/glue everywhere the death bond was.

 

[Staybolt]

I have one that the display won't come on until after a few minutes. I had another one that acted the same way

 

[Chevboy0167]

RE-cap the entire radio. Look for cold solder joints also. Remove all the Sony death bond glue and look for eaten away component legs and/or shorted parts from that glue.

 

[Chevboy0167]

May be worth a look also...
Go to YouTube and look up Defpom's Electronics, President Lincoln Repair, No.887

 

[Lkaskel]

I have one that the display won't come on until after a few minutes. I had another one that acted the same way

There are 3 caps on the display board that I have replaced and fixed things. Also, on the CPU board replace the 2.2uf 50v and the 0.1uf 50 v next to IC314, those are the CPU Reset circuit caps. They cause bootup errors like the blank display and no TX or RX. Thats from Rogerbird.....

 

[Chevboy0167]

Another tip... this is from Mike's radio repair.

I use GC Electronics Radio-TV Service Solvent to soften up and remove the "Death" Bond from components, Unsolder parts from board, drop them in a small glass jar, like baby food jar size, soak them for a while then remove and pluck the softened Bond off with tweezers and/or a pick.

Use caution doing this as some parts are fragile and unobtanium unless you make your own.

Last jar of solvent I got was about $40 to my door for 16 Fl oz. Not cheap but I use for so many other things also. Plus it doesn't take much, just enough to cover the part for soaking.